1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "SampleCode.h"
9 #include "SkView.h"
10 #include "SkCanvas.h"
11 #include "SkGradientShader.h"
12 #include "SkGraphics.h"
13 #include "SkImageDecoder.h"
14 #include "SkPath.h"
15 #include "SkRegion.h"
16 #include "SkShader.h"
17 #include "SkUtils.h"
18 #include "SkXfermode.h"
19 #include "SkComposeShader.h"
20 #include "SkColorPriv.h"
21 #include "SkColorFilter.h"
22 #include "SkTime.h"
23 #include "SkTransparentShader.h"
24 #include "SkTypeface.h"
25
make_bitmapfade(const SkBitmap & bm)26 static SkShader* make_bitmapfade(const SkBitmap& bm)
27 {
28 SkPoint pts[2];
29 SkColor colors[2];
30
31 pts[0].set(0, 0);
32 pts[1].set(0, SkIntToScalar(bm.height()));
33 colors[0] = SK_ColorBLACK;
34 colors[1] = SkColorSetARGB(0, 0, 0, 0);
35 SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
36
37 SkShader* shaderB = SkShader::CreateBitmapShader(bm,
38 SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
39
40 SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
41
42 SkShader* shader = new SkComposeShader(shaderB, shaderA, mode);
43 shaderA->unref();
44 shaderB->unref();
45 mode->unref();
46
47 return shader;
48 }
49
50 class ShaderView : public SampleView {
51 public:
52 SkShader* fShader;
53 SkBitmap fBitmap;
54
ShaderView()55 ShaderView() {
56 SkImageDecoder::DecodeFile("/skimages/logo.gif", &fBitmap);
57
58 SkPoint pts[2];
59 SkColor colors[2];
60
61 pts[0].set(0, 0);
62 pts[1].set(SkIntToScalar(100), 0);
63 colors[0] = SK_ColorRED;
64 colors[1] = SK_ColorBLUE;
65 SkShader* shaderA = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
66
67 pts[0].set(0, 0);
68 pts[1].set(0, SkIntToScalar(100));
69 colors[0] = SK_ColorBLACK;
70 colors[1] = SkColorSetARGB(0x80, 0, 0, 0);
71 SkShader* shaderB = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
72
73 SkXfermode* mode = SkXfermode::Create(SkXfermode::kDstIn_Mode);
74
75 fShader = new SkComposeShader(shaderA, shaderB, mode);
76 shaderA->unref();
77 shaderB->unref();
78 mode->unref();
79 }
~ShaderView()80 virtual ~ShaderView() {
81 SkSafeUnref(fShader);
82 }
83
84 protected:
85 // overrides from SkEventSink
onQuery(SkEvent * evt)86 bool onQuery(SkEvent* evt) override {
87 if (SampleCode::TitleQ(*evt)) {
88 SampleCode::TitleR(evt, "Shaders");
89 return true;
90 }
91 return this->INHERITED::onQuery(evt);
92 }
93
onDrawContent(SkCanvas * canvas)94 void onDrawContent(SkCanvas* canvas) override {
95 canvas->drawBitmap(fBitmap, 0, 0);
96
97 canvas->translate(SkIntToScalar(20), SkIntToScalar(120));
98
99 SkPaint paint;
100 SkRect r;
101
102 paint.setColor(SK_ColorGREEN);
103 canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
104 paint.setShader(fShader);
105 canvas->drawRectCoords(0, 0, SkIntToScalar(100), SkIntToScalar(100), paint);
106
107 canvas->translate(SkIntToScalar(110), 0);
108
109 int w = fBitmap.width();
110 int h = fBitmap.height();
111 w = 120;
112 h = 80;
113 r.set(0, 0, SkIntToScalar(w), SkIntToScalar(h));
114
115 paint.setShader(NULL);
116 canvas->drawRect(r, paint);
117 paint.setShader(make_bitmapfade(fBitmap))->unref();
118 canvas->drawRect(r, paint);
119
120 paint.setShader(new SkTransparentShader)->unref();
121 canvas->drawRect(r, paint);
122 }
123
onFindClickHandler(SkScalar x,SkScalar y,unsigned modi)124 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y,
125 unsigned modi) override {
126 this->inval(NULL);
127 return this->INHERITED::onFindClickHandler(x, y, modi);
128 }
129
onClick(Click * click)130 bool onClick(Click* click) override {
131 return this->INHERITED::onClick(click);
132 }
133
134 private:
135 typedef SampleView INHERITED;
136 };
137
138 //////////////////////////////////////////////////////////////////////////////
139
MyFactory()140 static SkView* MyFactory() { return new ShaderView; }
141 static SkViewRegister reg(MyFactory);
142
